He's criticizing discrimination on the basis of race (and gender), not advocating it.
He says that Google 'has created' (past tense) a discriminatory hiring practice.
Presumably his coworkers were hired in the past and not the present or future.
Thus, the hiring practices that prevailed when his coworkers were hired were discriminatory, per the author.
I believe that everyone should have a fair shot at a good career. I can't even begin to talk about how that is not the case in America - if we disagree here, I'm not sure we'll ever come to agreement.
It's not clear that the workers favored in this alternate pipeline are incompetent (which is really the implication that everyone is making). What is clear is that people with their perspectives are not as prevalent in the technology field.
Perhaps companies are recognizing a) the value of multiple perspectives or b) the structural difficulties that deny some people the same 'fair shot' we all have.
I'll leave you with this. The SAT should be a test of one's aptitude, perhaps readiness for college. If some individuals receive years of tutoring, but others have to go to the library to get test preparation, is our metric for college readiness fair? Maybe you'll say yes, but if we were talking about any other thing (cars, experimental models, you name it) we would clearly recognize these two groups had different pre-test levels of preparedness.
If you must spew hate, could you at least choose a more interesting criteria than skin tone or genitals? These have been done to death.